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passwd on a simple script

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# 1  
Old 09-09-2010
passwd on a simple script
hi guys

I am working on a script which is basically a menu for some linux operators...
I need on this menu for the operators the option to change the password...
This are 2 linux servers using Linux heartbeat.

what I need is to change change the password using passwd command and replica that change to the secondary server....

I've been trying to capture the output of passwd command to implement my script but I have not been able to do it and to reflect the new password on the other server still I don't have any idea.... I tried dsh (commands on multiples server but it did not work)

thanks a lot
# 2  
Old 09-09-2010
"passwd" is designed not to be intercepted for pretty obvious reasons. Instead of trying to capture its input, try duplicating changes made to /etc/passwd or /etc/shadow.
This User Gave Thanks to Corona688 For This Post:
karlochacon
# 3  
Old 09-09-2010
Quote:
Originally Posted by Corona688
"passwd" is designed not to be intercepted for pretty obvious reasons. Instead of trying to capture its input, try duplicating changes made to /etc/passwd or /etc/shadow.

got your point

in that case when the user changes his password on node01 I should use a scp o rsync to the node02 to sync password on both nodes?

but how could I scp/rsync passwd - shadow file when a normal user can not overwrite those...
# 4  
Old 09-09-2010
Unless you configure sudo to allow you, you can't. Duplicating passwords in any of these ways is of course dangerous -- any bug in your code could become an exploit, or lock you out. LDAP or NIS might be better ways to share passwords, but take a bit of work to get going.

You can also do some trickery with ssh and expect. expect is sufficiently tricky to fool interactive commands into believing it's an interactive terminal but using it opens you up to the security pitfalls terminal-only behavior was supposed to prevent.

Even then I wouldn't try intercepting the input to 'passwd' as much as capture the new password into my own script, then feed it into passwd both locally and remotely.
Last edited by Corona688; 09-09-2010 at 04:27 PM..
This User Gave Thanks to Corona688 For This Post:
karlochacon
# 5  
Old 09-09-2010
chpasswd(8) might help. I agree with Corona688 - avoid scp/rsyncing /etc/passwd or /etc/shadow directly.
This User Gave Thanks to frank_rizzo For This Post:
karlochacon
# 6  
Old 09-09-2010
Quote:
Originally Posted by frank_rizzo
chpasswd(8) might help. I agree with Corona688 - avoid scp/rsyncing /etc/passwd or /etc/shadow directly.
I just added passwd in the script I am creating and it request the password successfully but I'm still have no idea to sync the password with the other server

As far I know chpasswd command only takes plain text...
# 7  
Old 09-09-2010
Quote:
Originally Posted by karlochacon
As far I know chpasswd command only takes plain text...
please read the man page.
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